Centrifugal filling means for compression molds



April 7, 1942. (a. DUDEN 2,273,772

CENTRIFUGAL FILLING MEANS For: COMPRESSION MOLDS I Filed Oct. 24, 1938 3Sheets-Sheet 1 v 15 rfl /711 April 7, 1942. e. DUDEN 2,278,772

CENTRIFUGAL FILL ING MEANS FOR COMPRESSION MOLDS Filed Oct. 25, 1938 ssneensw heep April 7, 1942. e. DUDEN 2,278,772

CENTRIFUGAL. FILLING MEANS Fofi COMPRESSION MOLDS Filed on. 24, 1938 sSheets-Sheet s i 1 14 T 12 I ------tas Patented Apr. 7, 1942 CENTRIFUGALFILLING MEANS FOR COMPRESSION MOLDS Gustav Duden, Dusseldorf, Germany,

assignor to Naamlooze Vennootschap: Maatschappij tot Exploitatievan tenBosch Octroolen N. V.,

Netherlands, a corporation of the Arnhem, Netherlands ApplicationOctober 24, 1938, Serial No. 236,775 In the Netherlands October 26, 19371 Claim. (Cl. 18-30) This invention relates to an improved constructionfor the centrifugal filling means for compression molds used insupplying pulverulent material thereto.

Heretofore a wheel provided with blades and located in a drum shapedcasing has been used for supplying a predetermined weight-quantity of apulverulent material to a compression mold. Such material is fedlaterally into the casing and is subjected to centrifugal action priorto the transference of a portion of the material through a tangentialopening provided in the circumference of the casing leading to ,thecompression mold to be filled.

The operation of such a device is based upon the constant presence of aquantity of pulverulent material which is kept in motion by the bladedwheel and since it is practically impossible to supply to the casing theexact quantity of material which is discharged therefrom, such supply isgenerally slightly in excess of the amount discharged from the casing.-

Therefore the drum shaped casing tends to become oversupplied and it hasbeen proposed to provide a discharge conduit communicating with one ofthe lateral walls of the casing through which, due to the air current insuch conduit, such excess of material may be discharged.

An object of the present invention is to provide a constructionimproving the discharge of the excess pulverulent material and at thesame time return such material to the supply opening.

A further object of the invention is to provide an adjustable overflowopening located in a lateral wall of the drum shaped casing and locatedat some distance from the inner circumference thereof. Such openingcommunicates with a space in which supply pockets are movable andtherefore the pockets are successively brought into communication withthe overflow opening.

A further object of the invention is to utilize the supply pockets forsupplying the pulverulent material to the drum shaped casing. Therefore,the space or compartment through which said pockets are moving isprovided with a supply opening communicating with the drum shaped casingwhich is located in advance of the overflow opening with reference tothe movement of the bladed wheel and also closer to the axis of rotationof the bladed wheel.

A further object of the invention is to provide a construction whereinthe supply pockets are provided at the circumference of a rotatablymounted disc and such pockets extend into a supply reservoir or hopperfor the pulverulent material.

A still further object of the invention is to provide means for varyingthe character or the overflow opening during the operation of thedevice.

Other objects will become more apparent and the invention will be morefully understood with reference to the detailed description below andthe drawings in which:

Figure l is a vertical cross-sectional view of the device with portionsshown in elevation for greater clarity, taken parallel to the plane ofthe bladed wheel.

Figure 2 is a similar view with the bladed wheel removed.

Figure 3 is a cross-sectional view taken on the section line III-III ofFigure 1.

Figure 4 is a cross-sectional view taken on the section line IV-IV ofFigure 1.

Figure 5 is a cross-sectional view taken on the section line V-V ofFigure l, with certain parts shown in plan for greater clarity, and

Figure 6 is a view similar to Figure 2 showing the overflow opening in adifferentadjusted position.

Referring to the drawings, the drum shaped casing 3 encloses the bladedwheel 5 which is secured to a rotatable shaft 4 by means of the key I.The pulverulent material which is fed into the casing 3 is subject to acentrifugal action by the bladed wheel 5 as shown, for instance, in

Patent No. 2,093,028, granted September 14, 1937. By periodicallyopening the outlet 2 a portion of the material so treated may escapethere- I through, in order to be preliminarily compressed within thespace I by a plunger 6 while the outlet 2 is closed in the mannerdisclosed in appli cants co-pending application Serial No. 210,540,filed May 2'7, 1938. Afterwards, the material together with thecompressed mass 6 already present is pushed into the compression mold 9.

The casing 3 is continued upwardly by the portion 14, which is integraltherewith. A rotatable shaft I l is mounted in the portion I l and tothis shaft are secured the two pocket wheels l5 as shown moreparticularly in Figure 3, by means of the keys IS. The pulverulentmaterial to be treated is placed in the hopper l'l located at the upperpart of the portion I4. The material in the hopper will fill theuppermost pockets 19 located upon the periphery of the pocket wheel.Radial blades l8 serve as partitions between the pockets. A rotation ofthe pocket wheels in the direction of the arrow in Figure 2 will movethe filled pockets downwardly to the open connection between the portionH and the casing 3. At this point the pockets empty into the centralportion of thecasing 3.

Upon a further rotation, the pockets are closed by the wall 2|. The sidewalls of the pocket are closed at all times by the plates l2. Therefore,by means of the walls 2| and the plates i2, the pockets are entirelyclosed until they reach the overflow opening 13. The overflow opening l3permits the pocket to communicate with the space in which the bladedwheel 5 is rotating.

The portion H of the casing is provided with spaced lugs 30 (see Figure5) in which is pivoted a lever 23 by its trunnion 31. The plates ii arefreely rotatable upon the shaft II and are provided with alignedapertures 32 in whicha pin 33 secured upon one end of the lever 23engages. The'other end of the lever 23 is pivotally connected to a bolt22 as shown more particularly in Fig. 2. The free end of the bolt 22extends through an opening provided in an abutment 34 fixed to thecasing 3 by the bolts'35 which serve to secure the casing 3 to thecompression space I. The nuts 36 threaded upon the bolt 22 serve tosecure the bolt 22 to the abutment 34 in any desired adjusted position.As will be noted, a lowering of the bolt 22 will change the position ofthe overflow opening l3 as shown in Figures 2 and 6. a

The opening I3 serves to give to the material which is supplied inexcess to the casing 3 an opportunity to escape again. The materialwhich is received in the pockets [9 in this manner will be carried alonforwardly and the pockets will be completely filled from the hopper l1and the scale of operations will be repeated.

By adjusting the plates ii, the thickness or (see Fig. 2) of the ring ofmaterial formed by the centrifugal action is modified according asconditions may require.

As the overflow opening I3 is always in connection with a closed pocket,an air current can not be produced notwithstanding the operation of thebladed wheel 5. Therefore, only excess material is removed through thisopening. As is obvious if an air current were produced, such air currentmight carry along more than the excess material to be removed.

Although in the embodiment of the invention above described which is thepreferred construction the pockets engaging successively with theoverflow openings I3 are also used for supplying the pulverulentmaterial to the casing 3, it is obvious that the construction may besuch that the pockets will serve successfully to evacuate any excesssupplied material. It is also obvious that instead of a circular paththrough which the pockets move such pockets may traverse a closed pathof a different configuration.

I claim:

. A device for filling a compression mold or like space with apulverulent material comprising a casing, a bladed wheel rotatablymounted within said casing, a plate located at each side of said Wheeland eccentric thereto, one of said plates having an overflow openingtherein, means for rotatably mounting said plates, a pivoted leverconnected to said plates and means for adjustably securing said lever infixed position whereby said overflow opening may be varied with respectto the axis of rotation of said bladed wheel.

GUSTAV DUDEN.

